Sorry, I have not explained well.I mean that the new version (5.50 from 2017) of winrar or rar.exe under the command line, is not compatible with the versions of AmigaOS that currently exist.And every time more compressed files appear in this format. For example, the Amiga CD32 Alternate Covers CDs can not be decompressed, it does not give an error, but no file appears.

Also our old newlib port miss sys/statvfs.h with fsblkcnt_t support, which is also as above funcions can be added directly to port. Sources:

/*
* Copyright (C) 2016 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/

/* If building on native we need to use the system libraries instead */
#ifdef CPU_NATIVE
#pragma GCC system_header
/* without the GCC pragma above #include_next will trigger a pedantic error */
#include_next <sys/statvfs.h >
#else
#ifndef SYS_STATVFS_H
#define SYS_STATVFS_H

After sources of above functions will be added to port, and all will be links, then there need to be done usuall amiga specific changes (sources of diffs for which i found in morphos and 68k ports of old versions from the page where you download current sources).